IOWA CITY, Iowa (AP) — The City Council has again voted to hold a voter referendum on eliminating Iowa City’s ordinance that prohibits people under 21 from entering most bars after 10 p.m.

The measure requires a third affirmative vote of the council before the referendum election can be scheduled this fall.

The Iowa City Press-Citizen says (http://icp-c.com/1cvc2Jv) organizers had filed a petition with more than 2,600 valid signatures, calling for the council to repeal the bar entry age or to send a referendum to voters.

In support of the ordinance, council members said data collected by the University of Iowa show fewer students are drinking heavily now that the 21-only ordinance is in place.

The measure was implemented in 2010 and already has survived one referendum vote.